4 Dead In Oklahoma Hospital Shooting, Tulsa Police Say

Oklahoma's second mass shooting in three days occurred on Wednesday, when four people were killed in a hospital shooting, including the shooter.

The four people who were killed at the St. Francis Hospital campus were the shooter, the police department said.

Police are still searching the medical building, and it's not clear if the man shot himself or was killed by police.

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Just days before the incident, one person was killed and seven were injured in a shooting at a Memorial Day event in Oklahoma.

Mass shooting in Texas followed 2 years of surging U.S. gun sales.